Facebook Messenger continues to improve and innovate as the app matures. It takes on messaging giants like Viber and Skype while strengthening its connection with the core Facebook experience. With voice and video calling, easy media sharing, the very useful Chat Heads interface, and additional tie-in applications like GIF Keyboard and fun games for people to play, there’s a lot to do in Messenger, and the future looks bright. That said, for all the features and communication capabilities that it offers, performance is a big issue for many devices, with other apps sometimes slowing to a crawl while Messenger or Chat Heads are active. It’s a minor quibble that can be resolved by closing the app or swiping away the Chat Heads, but it deserves recognition and attention from developers.